On Mon, Mar 05, 2018 at 11:02:56AM +0530, Vinod Koul wrote: > On Fri, Mar 02, 2018 at 08:32:20AM +0000, Alexey Brodkin wrote: > > Hi Vinod, > > > > On Fri, 2018-03-02 at 13:44 +0530, Vinod Koul wrote: > > > On Mon, Feb 26, 2018 at 05:56:28PM +0300, Eugeniy Paltsev wrote: > > > > This patch adds documentation of device tree bindings for the Synopsys > > > > DesignWare AXI DMA controller. > > > > > > > > Signed-off-by: Eugeniy Paltsev <eugeniy.palt...@synopsys.com> > > > > --- > > > > .../devicetree/bindings/dma/snps,dw-axi-dmac.txt | 41 > > > > ++++++++++++++++++++++ > > > > 1 file changed, 41 insertions(+) > > > > create mode 100644 > > > > Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.txt > > > > > > > > diff --git a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.txt > > > > b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.txt > > > > new file mode 100644 > > > > index 0000000..f237b79 > > > > --- /dev/null > > > > +++ b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.txt > > > > @@ -0,0 +1,41 @@ > > > > +Synopsys DesignWare AXI DMA Controller > > > > + > > > > +Required properties: > > > > +- compatible: "snps,axi-dma-1.01a" > > > > +- reg: Address range of the DMAC registers. This should include > > > > + all of the per-channel registers. > > > > +- interrupt: Should contain the DMAC interrupt number. > > > > +- interrupt-parent: Should be the phandle for the interrupt controller > > > > + that services interrupts for this device. > > > > +- dma-channels: Number of channels supported by hardware. > > > > +- snps,dma-masters: Number of AXI masters supported by the hardware. > > > > +- snps,data-width: Maximum AXI data width supported by hardware. > > > > + (0 - 8bits, 1 - 16bits, 2 - 32bits, ..., 6 - 512bits) > > > > +- snps,priority: Priority of channel. Array size is equal to the > > > > number of > > > > + dma-channels. Priority value must be programmed within > > > > [0:dma-channels-1] > > > > + range. (0 - minimum priority) > > > > +- snps,block-size: Maximum block size supported by the controller > > > > channel. > > > > + Array size is equal to the number of dma-channels. > > > > + > > > > +Optional properties: > > > > +- snps,axi-max-burst-len: Restrict master AXI burst length by value > > > > specified > > > > + in this property. If this property is missing the maximum AXI burst > > > > length > > > > + supported by DMAC is used. [1:256] > > > > + > > > > +Example: > > > > + > > > > +dmac: dma-controller@80000 { > > > > + compatible = "snps,axi-dma-1.01a"; > > > > > > do we need "snps here..? > > > > Synopsys is this IP-block vendor so shouldn't we put it that way? > > Not a DT expert but why should vendor name come here, you can read the > properties from device node, vendor name seems redundant to me
I don't follow... In any case, yes, it must have a vendor prefix. It should also have a compatible for the vendor(s) that integrate the block because they all break it in different ways. Speaking of which, we already have snps-dma.txt and at least Analog Devices binding using a Synopsys DMA. What's the difference? Rob